book Maths Puzzle Numerical Ability

please solve this equation: I = prt , solve for p

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book Other Question

a two digit number is 6 times the sum of its digits. the tens digit is 1 more than the units digit. find the number. P(x)=2x^2-3x^2+4x-5

The P(1)=-2
P(2)=7 and
P(-1)=?